Two nuclei combine to form one nucleus in nuclear fission.

False

Explanation:

In a nuclear fission, big nucleus of a radioactive atom splits into two or more smaller atoms.  

In a nuclear fusion two nuclei combine to form a single nucleus.

Fission and Fusion are two opposite process.

Fusion is an extremely rare process as there is no methodology developed so far which can stand against the repulsion force of two nuclei. However nuclear fission is now used in generation of electricity.  

Thus, it is clear that Fission is division of nucleus while fusion is combination of two or more nuclei.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

a few examples of ethical concerns involving genetically engineering of humans include

-privacy of genetically tested people

- potential side effects

-long term effects